Typewriting machine



July 17, 1923- 1.461.718

' F. H. ARMSTRONG TYPEWRITING MACHINE 1 Filed Sept. 17, 1920 4 sheets-swat 1 allot "41 ,0

July-17, 1928- 1,461,718

F. H. ARMSTRONG TYPBWRITING MACHINE Filed Sept. 1'7, 1920' 4 Sheets-Sheet 3 July 17, 1923- F. H. ARMSTRONG 'lYPEWRITING MACHINE Filed Sept. 17/1920 4 Shets-Sheet 2 wm'nlioz July 17, 1923- 7 1,461,718 F. H. ARMSTRON TYPEWRIT ING MACHI NE Filed Sept. 17, 1920 4 Sheets-Sheet 4v I awuewli'oz 5 YAlmJb'org, I

dam a, a

atented July 17,1923.

FRANK H. ARMSTRONG, OF AUBURN, NEW YORK, ASSIGNOR T0 CORONA T'YPEWRITER COMPANY, INC. QF GROTON, NEW YORK. A CORPORATION OF NEW.YORK.

TYPEWRITING MACHINE.

Applicationfiled September 17, 1920. Serial No. 410,9a0.

tween the type-carrying means and the laten of such machines to permlt the pr1ntmg of letters or characters of different case from a single type-carr1er in machlnes havlng type-carriers each of whichis provided with a plurality of types.

In the preferred embodiment of the in vention shown in the drawings, the change of case is effected by shifting a type-bar hanger or segment in a vertical plane relatively to the machine frame; the construc-' tion illustrated being designed for use in a front-strike portable typewriting machine having a platen and carriage foldable forwardly over the keyboard in a manner simi lar to the well-known Corona typewriter.

It will be obvious, however, that the invention may be embodied in non-compactible as well as compactible machines, and in machines in which the change of case is effected by shifting the platen. .It will be understood also that, while I have shown a.

- mechanism in which the shiftable support moves vertically, the invention is not limited to shift mechanism in which a segment or platen is moved in a vertical plane to I change the case.

t ide improved means -for imparting a double case-shift movement to a type-bar' segment or a support shiftable to, change the relation between the type-bars and platen of a typewriter; to provide ,im

proved antifriction means for supporting and guiding atype-segment carrier-in a;

segment shift machine; to provide a jcaseshift mechanism practically all of the parts fof which are formed of sheet metal; to provide improved means whereby a case-shift movement may be imparted to a type-bar:

The invention has for its objects to,pro-- ported at three points only by antifriction hearings; to provide antifriction supportln'g and guiding means for asegment-carrler or other member shiftable to change case in which wear in'all the bearings is automatically taken up; and to provide antifriction guiding means at opposite sides of a support which is shiftable to change case so constructed that the companion race- ;way members of all the bearings are forced toward each other-by a single spring.

Other objects of the invention will more fully appear from the description ofthe invention with reference to the accompanyin; drawings, in which- Figure 1- is a plan view of the vcase-shift mechanism, the segment being removed to more clearly illustrate the operating mechanism;

Fig. 2 a plan view ofthe segment and its shiftable support or carrier;

Fig. 3 a vertical longitudinal sectional view taken centrally. of the machine, the parts being shown in normal osition;

Fig. 4 view similar to *ig. 3 showing the Cap. shift position of the parts;

' Fig. 5 a view similar to. Fig. 3 showing the parts in Fig. shift position;

Fig. 6 a front elevation of the shift mech anism, partsof the frame and mechanism being broken away; 1

Fig. 7 a front elevation showing the segment-carrier and the antifriction bearings therefor; I '1 Fig. 8 a perspective view of the station v ary bracket located at the rear of the car-- rier; 1 Fig. 9 a fragmentary perspective view of the shift mechanism;

1. Fig. 10 a detail view showing a part, of the shift frame; I

Figs. 11 and 12 fragmentary side elevations showing the rear portions of the Cap. and F ig.v shift levers, respectively; i

Fig. 13 a horizontal sectional view on the line XIII--XIII of Fig. 7;

Fig. 14 an end View of the upper lefthand; raceway member on" the segment car- Fig, '15 a horizontal sectional view on the line XVXV of Fig. 7;

Fig. 16 a sectional view XVI- XVI of Fig. 7; Fig. 17 a perspective view'of the upper taken on the line e tending portion ofrac'eway member 6 is provided; at its upper and lower edges with} stationary raceway member and the bracket on which it is formed :located at the left-' hand side of the carrier; I

' Fig. 18 a perspectlve view of the pivotally supported raceway member and: the v anguraceway members toward each other.

In the construction illustrated in the drawings, the main frame of the machine is formed of pressed steel in one piece and comprises side walls 1 connected by a rear wall .2 and a front rail 3.' A sheet metal bracket 4 is rigidly secured to the front face of the rear wal 2 byfour screws 5 at a point midway between the side walls of the frame. Bracket 4 is provided'with a forwardly projecting arm adjacent its lower end lying in a vertical plane and doubled upon itself to form a raceway member 6. The inner portion of the doubled member 6 is rovided with a ball channel 7 facing toward the longitudinal center line of the machine and cooperating with an outwardly facing ball channel 8' in a forwardly'extending doubled raceway member 9 formed integrally with an integral arm or stem 10 depending from the lower edge of a sheet metal segment-carrying plate 11. The segment carrier 11 is of general arcuate form so as to conform substantially with the curvature of a curved type-bar hanger or segment 12 de tachably held thereto by three screws 13.

The segment carrier is only slightly larger than the segment and arm 10 on the carrier is located midway the ends of the carrier. 1

The channels in both raceway members 6 and 9 are of similar construction, being V- shaped in cross-section and formedby slittingthe rearwardly extending portion of the doubled member forwardly from its rear edge adjacent both they upper and lower edges of said portion and pressing the metal intermediate the slits toward the other portion of the member to form the ball channel.

The base of the ball channel rests against the forwardly extending portion of the doubled member," thus bracing the channel-carrying portion oftheraceway member. The two fingers or tongues 14 at the upper and lower ends of the raceway channels prevent the ball 15 in the raceway formed by channels 7 and 8,.from traveling beyond the ends of the channels and dropping out of the. raceway.

The channeled portion of each of the raceway members is preferabl provided along its rear edge with a sti ening flange, as

shown lying inthe same vertical plane-as the ba -stop fingers 14. I, The forwardly exbracing lugsldbent outwardly and engagedges.

is provide at each end with integral, for-.

wardly projecting, doubled raceway members or arms 17 of the same construction as "racewa member 9, said members lying in a vertica lane and being provided with outwardly acing ball channels 18 and ball-stop fingers 19 formed in the same manner as the channels and fingers on members 6 and 9.

The ball channel 18 in the left-hand raceway member 17 cooperates with an inwardly ,facing ball channel 20 in a similar doubled raceway member 21 rejecting forwardly from the inner side 0 a bracket 22 rigidly held by screws 23390 the rear wall .2 of the machine frame adjacent the left-hand side of 'the' machine. The raceway member 21 is provided with ball-stop fingers 24 and a ball 25 is'confined in the raceway formed by channels 18 and 20; Member 21 'is also pro-- vided with bracing lugs 26 engaging the front face of bracket 22. The ball channel 18 in the right-hand raceway member 17 cooperates with an inwardly facing ball chan ml 27 in a doubled raceway member or arm.

formed on the bracket 4. Member 28 is pro vided with bracing lugs 32 which engage the front face of, arm 29 and'is also provided with ball-stop fingers 33. A ball 34 is confined in the-raceway formed by channels 18 and 27 in the complementary raceway members 17 and 28.

The depending central or stem portion 10 of the segment carrier 11 is provided with an integral angular arm .35 opposite the raceway member 9 to which the inner end of a thrust link 36 is connected by a separably interlocked pivotal connection. The shank of a-forwardl bent T-shaped la 37 on the ion inner end of t e link36 exten'dst rough the slot 38. in the outer end of arm 35-.and bears a inst and rocks on the rounded inner edge 0 the slot. The en agement of the T-lug 37 .and fingers 39 on link '36 with the slotted portion of arm 35 prevents separation of the link from the arm by movement in any direction, except toward the right of the machine, while permitting'the necessary pivotal movement of the link when the carrier moves arm 29. which carries. the raceway member 28:2 Lever41 is'pivotally held at 43 toan arm 44on bracke't 4 and spring 42;is under tension and constantly tends to swing arm 29 toward the leftand (through lever 41) the left. It seen that g.

.also'constantly tends .tothrust link 36 toward 42 not only yieldably forces raceway member28 toward raceway member 17 at the right hand end of the carrier, but also yieldably forces the carrier bodily toward the left through arm 29 andthrough lever-41 and link 36 and thus yieldably forces raceway member 9 and the raceway member 17 at the left-hand side of the carrier toward therfixed raceway members 6 and 21. Wear in all three of the raceways will thus be automatically taken up b the single spring. Moreover one channe member of each raceway,

is free to yield or move away from its com panion raceway member against the tension of spring 42 so that jamming or sticking of the carrier is prevented'in the event of particles of grit, rubber, or the like finding their way into the ball channels.

- The stemportion 10 of the carrier 11 is provided at its lower end with a forwardly extending foot 45 having an upstanding flange 46 at its forward end. A transversely extending metal bar 47 is connected midway its ends with the flange 46 by a screw 48. A swingin shift frame of substantially U- shape in p an view is mounted in the main frame forward of the's'egment carrier. This shift frame comprises a transversely extending rock shaft 49, j ournalled at its ends on the polnts of two pivot screws 50 whichextend 'through the side walls 1 of the main frame,

and a pair of'rearwa-rdly extending sheet metal rock arms 5.1 fixed on said shaft to rock therewith in unison. The rock arms 51 have reduced endrportions 52 fitting loosely in apertures 53 in bar 47. adjacent the opposite ends of the bar. The connection between permit the necessary relative movement therebetween due to the swinging movement of the arms and the direct vertical movement of the bar. A-coiled spring 54, connected at its upper end with a tension adjusting screw 55 threaded through an arm 56 on bracket 22, is secured at its lower end to one of .the arms 51 of the shift frame. Spring 54 has sufficient tension to rock the shift frame upwardly and shift the segment carrier .and segment to its-normal or up.-

permost position, shown in Figs. 3, 6 and 9, and hold the segment and carrier in this position until the shiftframe is rocked downwardly by one of the shift key levers. v

The normal or lower case character printing osition of the segment is determined by an adjustable stop screw 57 threaded through a yoke 58 formed on bracket 4 and which is adapted to engage an abutment 59 on the type-bar segment 12. A'suitable lock nut is preferably screwed on stop 57, as shown, for locking the stop in adjustedposition. The lowermost or Fig. shiftposition of the segmentis determined by an adjustable stop screw 60 threaded through a yoke 61 formed on bracket 4 and adapted tobe engaged-by the foot 45-on the carrier, as shown iii-Fig;

Theintermediate or Cap. shift position" of the segment is determined by an adjustable stop screw 62 threaded through the transverse member of'a. U-shaped sheet metal bail 63 and adapted to beengaged by foot 45, as shown in Fig. 4, to'arrest the segment in Gap. shift position. A suitable lock nut is screwed on stop 62,. as shown. The side arms of the bail are connected at their upper ends by two pivot screws 64 with an arm 65 on bracket 22 and with a bracket 66 secured to the right hand side wall of the machine. A pair of coiled springs 67 secured at their forward ends to the side arms of bail 63 and at their rear ends to the rear wall 2 of the main-frame normally pull the bail rearwardly to the position shown in Figs. '1,

3 and 4 so that stop 62 is normally in position to arrest the segment and carrier in Gap. shift position. The.rearward movement of the bail under the influence of springs 67 is arrested when the bail reaches the position shown in Fig. 3, in which position, the transverse member of the bail is parallel with and a slight distanceabove lugs 68, projecting forwardly from yoke 61 on bracket 4, the side arms of the bail are vertical, and the rear edge of the forwardly ofiset transverse member of the bail touches a vertical plane through the pivots 64. This arrangement permits the rearward movement of the bail to normal position without danger of binding and rovides a rigid support for the bail arms 51 and bar 47 is sufliciently loose to and stop 62 thereon when theshift mechanisment for printis operated to position the se ing capital letters, as more ully hereinafter described.

Duplicate pairs of shift key levers are provided at opposite sides of the keyboard for rocking the shift frame. The two sheet 'n'ietal Cap. shift key levers 69 and the two sheet metal 'Fig.- shift key levers '70 are pivotally supported at-their rear ends on a sheet metal key lever fulcrum bar 71 which extends transversely of the machine and is secured at its ends to theside walls 1 of the main frame. The key levers are pivotally connected with the bar 71 by passing the hook portions 72 on .the rear ends thereof through. apertures 73' in the fulcrum bar. The levers are guided in slots 74 in brackets 75 secured to the side wallsl of the main frame and are yieldably held in normal posi: tion by individual return springs 76 connected with the levers and brackets 7.5. .Eachshift key lever is provided with a lug or abutment 77, the lugs on the levers overlying laterally extending lugs or abutments as I its

-78 on the rock arms 51 of the shift frame so that whenever a shift key is depressed to pull the carrier and segment downwardly, through the mediumof bar 47.. When either ofthe Cap. sh' keysis depressed its supporting lever wil ,rockthe shift frame downwardly until foot 45 on 3 the segment. carrier strikes the intermedimaining stationary asthere. is no connecate stop 62 carried by'bail 63, the bail retion between either of the key levers 69 and the bail. When foot 45 strikes stop 62 the long transverse member of the bail will flex slightly until it rests firmly onlugs 68 where it will be held as long as the shift key is 'proper position. When either of the held depressed. Lugs 68 thus back up 9r. support the bail and hold stop 62 firmyin I 7,

shift keys is depre'ssedtlie key lever 70 on which it Fs mounted not only rocks the shift frame downwardly to lower the segment car-- .rier, but also swings the bail63 forwardly to carry the movable intermediate stop 62 operating trip arm 79 extending upwardlyand rearwardly from a point adjacent the fulcrum of the lever and having an abutment or vertically extending end portion 80 in contact with the rear face of a lug 81 on the adjacent side arm ofbail 63. It will be observed that the bail-restoring springs 67,

' brackets 75.

heretofore referred to, cannot pull the bail rearwardly beyond the position shown in Fig.3 owing-to the'engagement of lugs 81 with the end portions 8O -of the trip arms 79 formed or key levers and the engagement of the upper edges of said key levers at points forward of their fulcrums'with the closed upperends of slots F74 in the guide A guide screw 82,- the shank of which en tends loosely through a curvedslot 83 in the. pivoted arm 29, is screwedintothe rear derangement of the antifriction bearings of angular arm 35 on the depending portion 10 the screw and the rear wall; of the frame prevent fore and aft tilting movement-of the arm 29 and lateral twisting of the-arm wh ch might otherwise take place and cause the segment carrier. A stop lug 84 is stamped out of the rear wall 2 of the frame adjacent the outer edge of the upper end of arm 29,- and a, stop lug 85 formed on plate 4 is normally located a little to'the right-of the forwardly extending portion-of the of the segment carrier. These two stop lugs serve to] prevent suflicient movementof the V arm '29 and -segment carrier 11 toward the ment of arm 29 and right to permit the balls to drop from the, raceways but permit a, slight swinging movew slight lateral movement of the carrier 11 to eompensatefforinaccuracies in the formation of the sheet'metal vary the relation between "type-carrying" l means and a, platen and provided with a pair ofball channels atone side of the cen-.

ter thereof and a' single ball channel at'the other side of, the center thereof, the channels atopposite sides of the-center of the support facing outwardly toward the ad-" g jacent side of the'frame, means on the frame provided ith linwardly facing ball channels cooperating with the ball channels on the support to form three race'ways, and 'ballsinthe raceways;

2'. In a typewritingmachine, the. combi-- nation of a frame, a vertically shiftable type-segment support having two ball 'chan nels facing towardone-side of the machine and a third; ball channel facing toward the opposite side of the machine,- stationary means on the frame having ball channels facing inwardly rand cooperating with saidball races,a'shiftable raceway member hav- Vfirst two channelson the support to form mg aninwardly facing ball channelcoo crating with said third ball channel on t e balls in the races, and a spring. movable raceway member inwardly transversel' of the machine;

3. n a typewr'iting mach" change case having ballchann at op osite sides thereof/facing outwardlyand s depending central portlonmhaving'fa ball channel facing outwardly, racewa' members on theframe having inwardly acing ball channels cooperatingwith one of the "side channels on the support. and the channel-on support to fornna ball raice, a ti friction n ai i 'e,t the combi-, Ijation ofaframe, a support-,slgiiftable to the depending portion of the support to race, and balls in said races.

nation epp rt s'hiftable o change case having ball channels at op site" sides thereof 'facingoutwardly an .a'

wall 20f, the main frame. The head of f m-tweme yayie able racewaymember on the frame hav ng an mwardly, facing ball channel cooperating withthe other side 'channel on the support to form-a third'zball depending central portion :having a ball channel facing outwardly, racewa members.

her on the frame having'aninwardly facing on the frame having inwardly acing ball channels cooperating wit/hone of the side channels on' the 'support' and the channel on the depending-portion of the support to form two races, ai yieldabl e raceway mem-' means race, balls in said races, and key-operated means connected with the depending portion of said support for shifting the support vertically.

5. In a typewritingmachine, the combi 'raceway member having an inwardly facingball channel cooperating with the ball chan-'. nel on the other laterally extending portion of the support to form a third ball race,

balls in sald races, and a spring normally] urging the pivoted raceway member in-- wardl 6. n a typewriting machine, the combination. of a support. shiftable vertically to change case having laterally extending pore tions provided with outwardlyfacing ball channels and a depending portion provided with a ball channel facing toward one side of the machine, stationary means provided with inwardly facing ball channels cooperating with the "ball channel on the. depending portion of the support and'the ball chan nel on one laterally extending portion of the support to form two ball races, apivoted raceway member having an inwardly facing ball channel cooperating with the ball the opposite side of the machine, means prochannel on the other laterally extending portion of the support to form a third ball race, balls in said races, and a spring connected with the. pivoted raceway member and the depending portion of the support to urge the same transversely of the ma chine toward the ball tionary means.

' 7..In a typewriting machine, the combination of.,a support shiftable vertically to change case and having three ball channels two of which face toward one side of the machine and the other of which faces toward vided with ball channels" cooperating with saidfirst two channels on the. support to with the other ball channel on the support;

form raceways, laterally yieldable means provided with aball channel cooperating to form a-third raceway,- balls in the raceways, and key-operated means for shifting the" support vertically.

8. In a typewriting machine, the combination of a support shiftable in an up-and .down direction, a type-bar hanger on said support, a three-point antifriction supporting and guiding means for the hanger supchannels on said staport embodying two; horizontally aligned all bearings at opposite sides of the center of the hanger support and a third ball bearing staggered relatively to the other two bearings, and means for automatically taking up wear in all three of said bearings.

9. In a typewriting machine, the combination of a main frame, a support shiftable in an up-and-down direction to vary the re-' lation between type-carrying means and a platen, a pair of side bearings for the support located adjacent opposite sides of the frame, a third side bearing for the support locatedadjacent the longitudinal center of the frame, each of said bearings comprising a pair of raceway members on the support and frame and a ball in the raceway formed by .said members, and means for yieldably urging the support sidewise throughthe medium of one of the raceway members on the frame.

1t). -,In a typewriting machine, the combi- I nation of a'main frame, a support shiftable im' an up-and-down direction to vary the relation between type-carrying means and a platen,'a pair ofside bearings for the support located adjacent opposite sides of the frame, a third side bearing for the support located adjacent the longitudinal cent er of the frame, each of said bearings comprising a pair of raceway members onthe support and frame and a ball in the raceway formed by said members, and means for yieldably forcing one of each pair of raceway members toward its companion raceway member.

11. In a typewriting machine, .the combination of a main frame, a support shiftable in an up-and-down direction to vary the relation between type-,carryng means and a platen, a pair of side bearings for the support located adjacent opposite sides of the frame, a third side bearing for the support located adjacent the longitudinal center of the frame, each of said bearings comprising a pair of raceway members on the support and frame and a ball in the raceway'formed by said members, one of said raceway members on the frame being bodily shiftable,

bodilysidewise in the-same direction.

12. In a typewriting machine, the coinbination of a main frame, a sheet metal caseshift support having portions thereof bent at an angle to thebody of the support and each formed with a ball channel, sheet metal guide members in the main frame and each having a channel cooperating with one of 'said channels on the support to form raceways, balls in said raceways', means for yieldably pressing one of said guide memers transversely of the frame toward the adjacent channeled portion of the support, and means for shifting the support to change case.

13. In a typewriting machine, the combination of an upright sheet metal type-bar segment support vhaving portions bent at an angle, to the body portion thereof and I I provided wit ball channels'facing the sides 'of the machine, sheet metal guide members 7 having bent portions extending fore and'aft ofthe machine and prbvided with ball chan nels cooperating with the ball channels on' the bent portions of the support to, form races, balls in the races, means for pivotally supporting one of said guide members, and a spring for swinging said pivoted member inwardly transversely of the machine 14. In] a typewriting machine, the ",combinationof a main fr'ame,'a type-bar; hanger support shiftable in a vertical plane in the main frame, means for guiding the support, a'type-bar hanger on-the support, a shift frame mounted inthe main frame to rock up and down about a horizontal axis exarresting the hanger'support at an intermediate position, and a pair of key levers each adapted to engage and rock the shift frame downwardly, one of said key levers being also adapted to rock said bail.-

151111 a typewriting machine, the combination of a main frame, a type-bar hanger support shiftable in a vertical plane in the main frame, means for guiding the support,

j a type-bar hanger on the support, ashift frame mounted in the main up and down about a horizontal axis extendame to rock ing transversely of the main frame and 001inected with the *hanger support, spring means ,for normally rocking the shift frame upwardly, aupair of vertically spaced; fixed stops for limiting the vertical movement ofp to the hanger support, a bail pivotally sup ported 1n the main frame to swing fore and aft of the machine, a stop on said bail for 'arrest-ingthe hanger support at an interthe stop thereon in sup ortarrestin tron, anda pair of key evers each a apted toen age and rock the shift frame, down mediate position, spring means for normally swinging said bail inone direction to place 1.

posia war y, onepf said levers being unconnected wlth the ball and the other having an arm for rocking the bail to carry the stop. thereon out of support-arrestingposition.

.16. A sheet metal type-bar ha er snpport provided adjacent'its ends wit a palr' of oppositely facing raeesand hgving a laterally exten' a key lever ada' t g depending portion substantially midway its I ends provided with a ball facing in the 7 same direction ,as one of the end races,

17.- A. sheet metal type-bar hanger support of approximately-,Y-shape having an outwardly facing ball race at one 'de-of the central dependingportion thereof'and a -pair of outwardlyfacing ball races at the ends of the upwardly and outwardly extending portionsthereof.

18. In a typewriting machine, the combination of an upright sheet metal segment car- .rier, ha type bar segment on the. carrier, said fcarrierq'bein'gprovided with vertical ball channels" adjacent opposite ends of the segment facing the sides of the machine and also having a central portion depending below the, segment provided with avertical ball channel facing one side of the machine,

stationary sheet metal guide members pro- J vided with vertical ball channels cooperat-- ing with the ballchannel on' the depending portion of the carrier and the similarly facing end channel on the c'arriento form races,

'a yieldably held sheet metalguide member provided with an inwardly faclng ball channel cooperating with the other end channel on the carrier to form a race, balls in the races, and key-operated means for Shif ing the carrier. v V l9-.'A type-bar segment support comprising a sheet. metal plate having portions thereof bent at right angles to theplane of the plate and doubled back upon themselves,"

the outer part of each doubled portion of the plate having a portionthereof pressed inwardly v against the inner part and shaped to form a ball channel. 1

" 20. In a typewriting machine, the combination of a'main frame, a vertlcally recipios rocable type-hanger support, a type-bar hanger on the support, vertically extending raceway members on the support adjacent the-endsof thehanger formed with ball channels, raceway members on the frame provided with ball channels, balls in the v raceways formed by said raceway. members, said support having a central depending portion, a. bar extending transversely of the machine-held to said'depending portion of the supporta'nd provided withapertures adjac'ent its ends, a rock shaft extendin tran., versely of the frame, a pair of roe arms fixed on said shaft'ah one end and engagingloosely' in; the apertures in the bar at their other ends, one of said arms having a toreci rocatet esupport.- A ,v

a typewriting machine,"the combination of amain frame, a vertically recipf rocable type-hanger support, a type bar p i ofghereon, I and to ngage ud-projection,

hanger on the support, vertically extending racewa members. on the support adjacent the en of 'thehanger formed with ball channels, raceway members on the frame provided with ball channels, balls in the raceways formed by said raceway members, said support having a central depending portion, a bar extending transversely of the machine held to said depending portion of the support and provided with apertures adjacent its ends, a rock shaft extending transversely of the frame, a pair of rock arms fixed on said shaft at one end and engaging loosely in the apertures in the bar at their other ends, each of said arms having an outwardly projecting abutment thereon, and a pair of key levers fulcrumed in the I5 main frame at their rear ends at opposite sides of the main frame and overhanging the abutments on the. rock arms. I 22..A sheet metal typebar segment carrier comprising a fiat plate having portions thereof bent at right angles to the plane of .the plate and doubled back upon themselves, the doubled back part of each of said portions being slit adjacent both ends to form ball stop lugs and being pressed against its companion part along a line extending between said lugs to form a ball channel.

- In testimony whereof I hereunto afiix my signature.

FRANK H; ARMSTRONG. 

